Tighten Your Tummy

The fitness tip: You'll still need to do crunches. Rub on the lotion 20 minutes beforehand; skin will absorb it as you sweat. Reapply after you shower to prolong the firming, says David Bank, M.D., a dermatologist in Mount Kisco, New York.

End Underarm Wobble

The fitness tip: Grab the heaviest weight you can handle and do three sets of 15 triceps extensions: Hold dumbbells overhead, arms straight; bend elbows, lowering weights behind head. It's a great way to firm up the area under arms, says Tracey Wilson, a trainer in New York City.

De-Dimple Your Derriere

The beauty trick: Collagen is the building block of healthy skin, and vegetable collagen in Rodial Bum Lift, $130, helps boost it by leaving a layer of the protein on skin's surface to temporarily tighten.

The fitness tip: Rub the cream on cheeks twice a day, then do this glute lifter: Place a resistance band around your ankles and pretend you're ice skating, taking steps forward and outward, at 45-degree angles, for three one-minute sets. It looks silly, but it works!

De-Dimple Your Derriere

Tester verdict: "I felt awkward rubbing cream on my butt, but after pairing it with my new moves, my skin was firmer! I felt as if I'd had a more intense workout than if I'd only exercised." —Jaime S., 24

Look Toned All Over

The beauty trick: To be sleek from head to toe, try Jergens Skin Firming Daily Toning Moisturizer, $6, which has elastin. That's the protein in skin that helps it snap back, easing sagging, Dr. Bank says.

The fitness tip: Sculpt your entire body by getting on the floor and holding a plank (push-up position: straight arms, body in a straight line) for 30 seconds. This powerhouse pose targets every major muscle. Follow it with two sets of side planks for 30 seconds on each side.